Flexible Display Edge Structure with Path Holes for Adhesive Flow
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Solution Overview
Problem
Flexible display devices face issues with air bubbles forming at the edge portions during processing, leading to reduced reliability and poor folding characteristics due to stress and potential cracking.
Innovation Solution
The solution involves improving the edge portion configuration by creating path holes and inorganic dummy patterns in the dead areas of the display device, allowing an adhesive layer to fill these areas and spread uniformly, thereby reducing stress and preventing air bubbles and cracking during folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the edge portion configuration is improved with path holes and inorganic dummy patterns, then bonding stability and folding characteristics are improved, but device complexity increases
Solution Approach 1:
The dead area is divided into multiple path holes that guide adhesive flow, segmenting the bonding process into controlled pathways that prevent air bubble entrapment and improve bonding stability without requiring complete structural redesign
Solution Approach 2:
Inorganic dummy patterns are formed in advance in the dead area to create predetermined adhesive storage regions before the bonding process, ensuring proper adhesive distribution and preventing air bubble formation during subsequent assembly steps
2Reliability
If the edge portion configuration is improved with path holes and inorganic dummy patterns, then folding characteristics are improved, but device complexity increases
Solution Approach 1:
The edge structure is segmented into path holes and inorganic dummy patterns that create controlled stress distribution zones, allowing the adhesive to accommodate folding stresses without concentrating forces that would cause cracking
Solution Approach 2:
The inorganic dummy patterns are placed specifically in the dead area where stress concentration occurs during folding, providing localized reinforcement and adhesive storage exactly where needed to prevent cracking without affecting the overall device structure
3Reliability
If adhesive layer fills path holes uniformly, then air bubbles are prevented, but manufacturing precision requirements increase
Solution Approach 1:
The path holes are designed to enable the adhesive layer to self-distribute uniformly through capillary action and pressure during bonding, allowing the adhesive to automatically fill the path holes and eliminate air bubbles without requiring precise external control mechanisms
Solution Approach 2:
The path holes create a porous-like structure in the dead area that facilitates adhesive penetration and distribution, allowing the adhesive to flow into and fill the path holes uniformly while trapping and eliminating air bubbles through the controlled pathways
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the reliability of the flexible display device by preventing air bubbles and cracks, improving its folding characteristics and maintaining flexibility without breakage.
Implementation Method 1
an adhesive layer between the encapsulation layer and the touch electrode array to fill the path holes
Data Source
AI summary
A flexible display device includes a first base having an active area and a dead area surrounding the active area, the first base including a pad portion provided in the dead area on one side of the active area; an array in the active area of the first base; an encapsulation layer configured to cover the array; a second base opposite to the first base; a touch electrode array on the second base to be opposite to the active area of the first base; a plurality of path holes in the dead area on at least one of the other sides of the active area on which the pad portion is not located; an inorganic dummy pattern spaced apart from the encapsulation layer among the path holes in a plane; and an adhesive layer between the encapsulation layer and the touch electrode array to fill the path holes.